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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 24th March 2015, 11:34 PM   #1
cbutterworth is offline cbutterworth  United States
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Default Getting the UL/triode and CFB switches right

I am about to finish wiring my SSE and want to get my switches right first time.

Looking at George's wiring diagram, I can figure out that UL would be the connection between the left and middle pins of the switch. Triode mode would be with the middle and right pins connected.

But, it is less clear with the CFB switch. To me, it seems that left and middle pins result in zero feedback, while the middle and right pins connected would give cathode feedback.

Also on my Edcor OPT, one wire is labelled 8 ohms, the other "common." Which would I connect to the switch? I suppose I could do this empirically and choose the quieter of the options.

Thanks,
Charlie

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Old 31st March 2015, 01:01 AM   #2
yoaudio is offline yoaudio  United States
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Maybe this will help you.
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Old 31st March 2015, 12:45 PM   #3
denny3249 is offline denny3249  United States
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Location: The frozen tundra of Cheeseheadland...
I posted this awhile ago for someone who had the same question... Hope it helps. Since you only have an 8 ohm tap, ignore the 4 & 16 ohm taps.

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Old 31st March 2015, 01:21 PM   #4
cbutterworth is offline cbutterworth  United States
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Default Getting the UL/triode and CFB switches right

Denny,

So the numbers on your diagram represent pins on the switches with 02 being the common pin?

If that is the case, then I have understood the UL correctly. With the CF there's something I am not quite getting.

Either way, given the solid volume from plain triode mode, I am actually wondering if I really need UL/CF at all - I'll ask this as a separate thread.

Thanks,
Charlie
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Old 31st March 2015, 02:20 PM   #5
denny3249 is offline denny3249  United States
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Location: The frozen tundra of Cheeseheadland...
The numbers represent the connection points on the board, but yes, 02 goes to the switch common... the middle connector. Both opt commons (white) go to connectors on one end of the switch, both 01 (ground) go to the other end of the switch. You are using a DPDT (double pole-double throw)switch like this?
DPDT Switch
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Old 1st August 2017, 06:01 PM   #6
Lee from Chitown is offline Lee from Chitown
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Question Wiring the Switches

I understand the wiring of the switches. My questions is routing the wires to the switches.
Should I run the wires simply beside each other or should they be twisted together like input wires, or OPT wires? Or?
Does it make any difference?
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Old 2nd August 2017, 02:20 PM   #7
mkane77g is offline mkane77g  United States
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Getting the UL/triode and CFB switches right
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Old 2nd August 2017, 04:06 PM   #8
Lee from Chitown is offline Lee from Chitown
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Thanks!
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